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3 cijfers X 3 cijfers met hulp [3]

3 cijfers X 3 cijfers met hulp [3]

 
4 8 5
9 8 2 ×
2 × 5 =
10
2 × 80 =
160
2 × 400 =
800
80 × 5 =
400
80 × 80 =
6400
80 × 400 =
32000
900 × 5 =
4500
900 × 80 =
72000
900 × 400 =
+ 360000
476270